- A. Supply of excess fuel
- B. Supply of excess air
- C. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
- D. None of these
Furnace Technology
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Overfire burning in a furnace is a phenomenon characterised by_____.
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An improved and fuel efficient version of the pusher type reheating furnace is the ______ furnace.
- A. Walking beam
- B. Shaft
- C. Tunnel
- D. Rotary hearth
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An example of indirectly heated furnace is the_____.
- A. Soaking pit
- B. Muffle furnace
- C. Reheating furnace
- D. None of these
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Artificial draught produced by a fan in the furnace can be controlled by the_____.
- A. Speed of the fan
- B. Damper
- C. Variation in the pitch of fan blades
- D. All of the above
-
Thermal efficiency of an open hearth furnace may be about ______ percent.
- A. 5
- B. 20
- C. 50
- D. 80
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An example of shaft furnace is the_____.
- A. L.D. converter
- B. Glass melting tank
- C. Blast furnace
- D. Soaking pit
-
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
- A. Low reactivity of carbonised residue containing high proportion of iron & sulphur
- B. Low forced draft & fuel bed temperature
- C. Thick firebed and preheated primary air
- D. All of the above
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Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by_____.
- A. Preheating the combustion air
- B. Oxygen enrichment of combustion air
- C. Preheating the fuel gas
- D. All of the above
-
Coke ovens in steel plant are heated by_____.
- A. Electricity
- B. Blast furnace gas/mixed gas
- C. Coke oven gas
- D. Both B and C
-
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ______ °C.
- A. 80
- B. 130
- C. 180
- D. 250